@misc{indiciae8d00a51aab40,
  title = {The Betsie Shale Member; a datum for exploration and stratigraphic analysis of the lower part of the Pennsylvanian in the Central Appalachian Basin},
  author = {Charles L. Rice and J.C. Currens and J.A. Henderson and J.E. Nolde},
  year = {1987},
  doi = {10.3133/b1834},
  url = {https://pubs.usgs.gov/publication/b1834},
  note = {Source identifier: b1834}
}